Tire-alarm.



J. B. .POLO. TIRE ALARM;

APPLIOATION FILED JAN. 27, 1912.

' Patented ew, 1912.-

V n QR mm lhumtoz NTTED PATENT @FFTQE.

JOSEPHB. FOLO, 0F CLEAR LAKE, SOUTH DAKOTA.

TIRE-ALA "an,

Specification of Letters Patent.

Application filed January 27, 1912.

Patented Dec.31,1912.

Serial No. avenge,

To all whom it may concern:

Be it known that I, Josnrn B. Form, a

citizen of the United States, residing at '-ficient' construction of attachment to be secured to the ordinary valve stem of the inner tube of a. pneumatic tire whereby when the air pressure is lowered to a predeterm ned degree, the device will sound an alarm and thereby apprise the occupant of the vehicle that a tire has become flat orthat its air pressure has been deflatedbeyond a desirable point.

The invention also has for. its object a simple. device of this character parts of which may be easily manufactured, readily assembled and which will be durable and not liable to get out of order. And the.invention also aims to generally improve this class of device and to render them more durable and commercially desirable.

With these and other objects in view as. will more fully appear as the description proceeds, the invention consists essentially in a tire, alarm including a casing adapted to be secured to the nipple end of a tire valve stem, a permanent magnet carried by the casing and having an opening extending therethrough and leading to the atmosphere, and a spring pressed valve unseating devlce adapted to be pressed aga nst a spherical valve which is normally adapted to close the openiu/rthrough the magnet, whereby when the pressure in the tire lowered to a predetermined degree, the spring pressed valve unseating device,

whiclrhas been t-ensioned to the required.

point. will move the valve away from its scat against the magnetic influence of the magnet, and thereby permit the air to issue.

from the outer end of the device in such a manner as to sound an alarm.

The invention also consists in certain constructions. arrangements and combinations of the parts that I shall hereinafter'fully describe and claim.

For a full understanding of the invention reference is to be had to the following description and accompanying drawmgs, in which,

Figure l is a transverse sectional view through a pneumatic tire and wheel felly and rrm showing the application of my inven tlon; F 1g. 2 1s an enlarged longitudinal sectional view of the device; Fig. 3 'is a transverse sectional view.on the line 3-3 of Fig. 2; and F 1g. 4 1s a similar view on the line'44 of Fig. 2. I I Referring to the drawing, the numeral .1

designates a wheel rim, 2 a pneumatic tire.

3 the felly on which the rim is mounted, and 4 the ordinary'or conventional valve stem, the valve of which is removed in car-' rylng out my invention. It is to be understood that any or all of these 'parts may be of any desired or apprdved form and construction, such,as are now employed in connection with pneumatic tires for the Wheels of automobiles or similar vehicles.

My improved tire alarm comprises a preferably cylindrical casing 5, which isformed at one end with interior screw threads 6 by which it is adapted to be detachably connected to the usual exteriorly threaded nipple 7 that is formed on the outer end of the stem 4 for the usual attachment of the orciinary dust excluding and valve removing cap and wrench. s

In the inner end of the casing 5 a permanent magnet 8 is held, said magnet as best illustrated in Fig. 2, being formed with a recessed inner face forming a socket as shown, the same being designated 9, said socket communicating with a centrally disposed and longitudmally extending bore 10 leading to the outer face of the magnet. 11 designates a relatively small andlight metallic valve which is pref erably spherical as. shown and which is adapted to be held, .by magnetic force against .the inner end of the longitudinal opening 10.-

Extending in the opening 10 and bearing against the ball valve 11 is a rod 12 which,

outer end of the rod 12 in its longitudinalmovement, together with the opening 10, and which 1s mounted in an open ng formed preferably in the outer reduced end 16 of the casing 5. The tubular stem '15 is preferably formed as an integral part of the cap. 17 which is intended to be manually turned whereby to vary the tension of the spring 14,-as required. A stop collar 18'screws on the casing and is held in adjusted position thereon by a set screw 19. This collar. .18 is I adapted to limit the'inwardmovement of' the cap 17 on the casing 5, whereby, when the .capis removed to apply: the tire pump for the purpose of inflating thetire, the collar will serve'as) an abutment and determine the 'prope r 'point of again placing the spring 1 1 under a tension when the cap is subsequently screwed back into p'lace.

- From the foregoing description inconnection with the accompanying drawings, (the operation of my improved tire alarm will be apparent. In the practical use of the de a vice, it will of course be'u'nderstood that the ball valve 11 will be held by magnetic attraction against the inner end of the opening 10, whereby to maintain the desired air pres' sure .within the inner 'tube of the tire. Should the air pressure he reduced, owing to a small leak in the tube, say forty (40) pounds to a square inch,'the spring 14:,

. which has been placed under the required tensionwill act to move the rod'12 inwardly so as'to push the ball valve 11 away from the inner end of the openinglO, whereby the air issuing through the opening 10, and

the ports'20'and 20* that'are formed in the casing 5, and cap 17 respectively, as illustrated in Fig. 2, 'Will producean a'udible signal and thereby apprise the occupant of the car that the tire hasbecome partially defiated. To again inflate the tire, it is only necessary to' remove a cap 17 and withdraw the spring 14 and valve unseated rod 12 and to then apply the ordinary pump nipple to the reduced end 16 of the casing 5. The

magnetic attraction will tend to hold the ball valve 11 on its seat and to return it to its seatduring the intermittent actions of the pump piston, even though the device should be held in more or less of a vertical position inverted from the position, illustrated in Figs. 1 and 2 of the accompanying drawing.

. It is to be particularly noted, as best illusnut adapted to be-screwed 'up against the telly 3. Preferably, in order to prevent the.

' ball'valve 11 (Fig. 2)*from entirelymoving out of the socket 9 of the magnet 8,'a..s xnall apertured screw plug' 24 is screwedin the' outer end of the socket, as clearlyillust-rated in the drawing.

VVh'le the accompanying drawing illustrates what I believe to be the preferred embodiment of my invention, it is to be understood thatthe invention is not'limited thereto, but that various'changes may be made in the construction, arrangement and proportions of the parts without departing from the scope of the invention, as defined in the appended claims.

Having thus described this invention,

what is claimed is 1. An alarm. of the character described,

includin a casing, a permanent magnet held 'in t e casing and formed with a socket terminating ina valve seat, and an opening valve adapted to be held on said seat by magnetic attraction, spring 'pres'sed means tending to unseat the valve against the force of the magnetic attraction, and means carried by the casing for producing an audible signal upon the unseating of the valve.

a 2. An alarm of the character described, including a casing, a, permanent magnet mounted in said casing and havinga valve seat and an opening leadlng outwardly.

therefrom, a valve adapted to be held on said seat by magnetic attraction, a rod. extending into said opening and engaging said leading outwardly from the valve seat,a ball.

valve, an adjustable spring encircling said rod and connected thereto atone end to press [the rod inwardly, and a bushing adjustably mounted in the casing and engaging the other end of the spring to vary the tension thereof, the casing being formed with meansunseating of the valve. .3. An alarm of the character described,-

for producing an'audiblesignal'upon the including a' casing, a permanent magnet securedv therein and formed with a valve seat and with an opening leading outwardly therefrom, a bushing adjustably secured to the outer end of the casing a' cap carryin said bushing, an. inwardly spr ng presse rod guided in said bushing and'.extending into said opening and bearing at its inner end against the valve, the outer end of the and. a stop collar adjustably carried by the casing and designed for engagement by the inner end of the cap for the purpose specified.

4. An alarm of the-character described, including a casing, -a permanent magnet -mounted insaid casing and formed with a valve seat, and with an opening leading outwardly therefrom, a valve adapted tobe .held on said seat-by magnetic attraction and' movable inwardly to-open position, a rod extending inthrough said opening and bearing at its inner endon the valve, the rod being provided intermediate its ends with a casing an'dthe cap being formed with ports,

rod and bearing against the bushing and the In testimony whereof I hereunto affix my collar, a bushing slidable in the'onter end with communicating ports for the purpose of the casing, a spring coiled around said specified. 10

collar, a set collar adjustably held on the signature in the presence of two Witnesses.

casing, and a cap carrying saidbaishing and JOSEPH B. POLO. screwing on the outer end of the casing and Witnesses: 4

adapted to engage the set collar, the outer GEO. S. LIVINGSTON,

end of the casingand the cap being formed FREDERICK S. STITT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. G. 

